System Pulse Leds - IBM 79463AU Installation And User Manual

The following table describes the problems that are indicated by various
combinations of the power-supply LEDs on a dc power supply and suggested
actions to correct the detected problems.
DC power-supply LEDs
IN OK OUT OK
On On
Off Off
Off Off
Off On
Off On
On Off
On Off
On On

System pulse LEDs

The following LEDs are on the system board and monitors the system power-on
and power-off sequencing and boot progress (see "System-board LEDs" on page
45 for the location of these LEDs):
Error (!) Description
Off Normal operation
Off No dc power to the
server or a problem
with the dc power
source.
On No dc power to the
server or a problem
with the dc power
source and the
power-supply had
detected an internal
problem.
Off Faulty
power-supply
On Faulty
power-supply
Off Power-supply not
fully seated, faulty
system board, or
faulty power-supply
On Faulty
power-supply
On Power-supply is
faulty but still
operational
Action
1. Check the dc power to the
server.
2. Make sure that the power
cord is connected to a
functioning power source.
3. Restart the server. If the error
remains, check the
power-supply LEDs.
4. Replace the power-supply.
v Make sure that the power cord
is connected to a functioning
power source.
v Replace the power supply
(see the documentation that
comes with the power supply
for instructions).
Replace the power supply.
Replace the power supply.
1. Reseat the power supply.
2. If a power channel error LED
on the system board is not lit,
replace the power-supply
(see the documentation that
comes with the power supply
for instructions).
3. If a power channel error LED
on the system board is lit,
(trained service technician
only) replace the system
board.
Replace the power supply.
Replace the power supply.
Chapter 1. The System x3550 M2 server
Notes
This is a normal
condition when no dc
power is present.
Typically indicates a
power-supply is not
fully seated.
31